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Radio frequency modulation output circuit and gain compensation amplifier thereof

A technology of radio frequency modulation and output circuit, applied in high frequency amplifiers, differential amplifiers, DC coupled DC amplifiers, etc., can solve the problems of low cost, high linearity and high isolation of high-performance radio frequency TV transmitters, and achieve Good intermodulation performance, compensation gain drop, and the effect of preventing signal crosstalk

Inactive Publication Date: 2013-12-04
HANGZHOU SILAN MICROELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above circuit structure can increase the operating frequency band of the circuit, it still cannot meet the requirements of low cost, high linearity and high isolation of high-performance radio frequency television transmitters

Method used

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  • Radio frequency modulation output circuit and gain compensation amplifier thereof
  • Radio frequency modulation output circuit and gain compensation amplifier thereof
  • Radio frequency modulation output circuit and gain compensation amplifier thereof

Examples

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Embodiment Construction

[0080] The radio frequency modulation output circuit in the prior art generally adds two channels of mixed frequency signals and then amplifies and outputs them. Crosstalk will occur between the two channels of mixed frequency modulated signals, which will affect the linearity of the circuit. In addition, due to the existence of various parasitic capacitances and inductances, as the frequency increases, the system gain will gradually decrease, resulting in a roll-off of the system gain in the entire broadband range, affecting system performance.

[0081] In the radio frequency modulation output circuit of the embodiment of the present invention, the first radio frequency modulation signal generated by the first mixer is amplified by the first amplifier circuit, and the second radio frequency modulation signal generated by the second mixer is amplified by the second amplifier circuit Amplify, and then add the amplified two-way signals. Since the mixing and amplifying circuits of...

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Abstract

The invention provides a radio frequency modulation output circuit, comprising: a first frequency mixer, a first amplifying circuit, a second frequency mixer, a second amplifying circuit and an output circuit, wherein the first frequency mixer is used for receiving a first input signal and a first carrier signal, and generating a first radio frequency modulation signal after frequency mixing of the signals; the first amplifying circuit is connected with the first frequency mixer, and is used for generating a first amplifying signal after amplifying the first radio frequency modulation signal; the second frequency mixer is used for receiving a second input signal and a second carrier signal, and generating a second radio frequency modulation signal after frequency mixing of the signals; the second amplifying circuit is connected with the second frequency mixer, and is used for generating a second amplifying signal after amplifying the second radio frequency modulation signal; and the output circuit is connected with the first amplifying circuit and the second amplifying circuit, and is used for adding the first amplifying signal and the second amplifying signal together and outputting the signal after addition. By using the radio frequency modulation output circuit provided by the invention, the isolation and linearity of the circuit can be improved, thereby stable gain within the whole wide band range can be ensured.

Description

technical field [0001] The invention relates to a radio frequency modulation output circuit and a gain compensation amplifier thereof. Background technique [0002] Many communication and instrumentation systems, such as TV transmitters, ultra-wideband wireless systems or other similar application systems, work in a wide frequency range, which means that the matching frequency band is 50% or greater of the center frequency. In a radio frequency transceiver system working in a wide frequency range, due to the existence of various parasitic capacitances and inductances in circuits at all levels, the performance of the system will be affected as the frequency increases. Therefore, it is necessary to add some high-bandwidth and low-cost circuits in the system to improve the performance of the system in the entire broadband range. [0003] figure 1 Shows a structural block diagram of a television radio frequency modulation system working in a wide frequency range in the prior a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H03F3/189H03F3/45
Inventor 褚云飞陈明洁胡铁刚
Owner HANGZHOU SILAN MICROELECTRONICS
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